Stainless Steel Needle Valves
Stainless steel needle valves can withstand higher pressure and have excellent sealing performance compared to other types of valves. Therefore, they are generally used for sealing gaseous or liquid media with small flow rates and high pressures. Stainless steel needle valves are ideally suited for use with pressure gauges, and most of them are designed with threaded connections.
Application Specifications
| Item | Details |
| Design and Manufacturing Standard | ANSI B16.34‑1996 |
| Connection Type | Female NPT thread connection; SW socket weld connection |
| Structural Feature | Conical surface sealing; lift plug type |
| Valve Inspection and Test Standard | API STD 598‑1996 |
| Material Standard | Carbon steel: ASTM A105‑1991 Stainless steel: ASTM A276‑1992 |
Scope of Application
Needle valves are widely applied in urban construction, chemical industry, metallurgy, petroleum, pharmaceutical, food, beverage, environmental protection and other industries.
Performance Specifications (Unit: MPa)
| Test Item | Pressure Value |
| Nominal Pressure | PN |
| Shell Test | 1.5PN |
| Sealing Test | 1.1PN |
| Pneumatic Test | 0.6PN |
| Applicable Temperature | ≤180℃ |
| Suitable Media | Water, steam, oil products, etc. |
Material of Main Components
| Model | Valve Body | Connector | Valve Stem | Nut | Packing |
| SS‑5PDF8 | 20# | 20# | 2Cr13 | 20# | PTFE |
| SS304 | SS304 | SS304 | SS304 | PTFE | |
| SS304 | SS304 | SS316 | SS304 | PTFE |
Main Overall Dimensions
| Size | L | NPT | H | D0 | Weight (kg) |
| DN6 | 57 | 1/4 | 82 | 57 | 0.4 |
| DN10 | 57 | 3/8 | 82 | 57 | 0.4 |
| DN15 | 68 | 1/2 | 90 | 63 | 0.55 |
| DN20 | 80 | 3/4 | 110 | 70 | 1.0 |
| DN25 | 90 | 1" | 130 | 89 | 1.6 |
Technical Parameters of Stainless Steel Needle Valve
| Item | Specification |
| Nominal Diameter | DN06‑DN25 |
| Sealing Material | Polytetrafluoroethylene (PTFE) |
| Valve Body Material | Stainless Steel 304, 316, 316L |
| Handle Material | Stainless Steel 304, 316, 316L |
| Connection Type | Threaded Connection (NPT, G, Rc, Rp, etc.) |
| Medium Temperature | PTFE: ‑20~180°C |
| Pressure Class | PN200‑PN400 |
Selection Notes for Stainless Steel Needle Valve
1. For pipeline systems and devices with low‑temperature media, select low‑temperature needle valves equipped with bonnets.
2. For pipeline systems of catalytic cracking units in refinery units, lift‑type needle valves can be adopted.
3. For devices and pipeline systems with corrosive media such as acid and alkali in chemical systems, select stainless steel needle valves with seat sealing rings made of austenitic stainless steel.
4. When flow regulation is required, adopt regulating needle valves with V‑notch driven by worm‑gear, pneumatic or electric actuators.
5. For urban coal gas and gas pipelines, select needle valves with flange connection and internal thread connection.
